Looks like my house - idea for trimming shiplap around my windows and transoms White horizontal paneling, in that cave of a mudroom. This would be inviting and look very pretty with your door knob hanger.
Full height cabinetry allows for easy concealment of brooms/mops/vacuum cleaner. Having the washer and dryer separated creates more benchspace in an already tight area. Perhaps framing the dryer with cabinetry would create a more streamlined look.
Built in tree book shelf - Inspiration Only but this is gorgeous. I so want this in my next home. There is also another tree on my project board I want to put in the same room as this. This would be great for a kid& room.